Power Systems A buchholz relay is used for protection of a transformer against all external faults both 1 and 2 nether 1 nor 2 protection of a transformer against all internal faults protection of a transformer against all external faults both 1 and 2 nether 1 nor 2 protection of a transformer against all internal faults ANSWER DOWNLOAD EXAMIANS APP
Power Systems A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu? 1.375 pu 2.4 pu 0.2 pu 3.975 pu 1.375 pu 2.4 pu 0.2 pu 3.975 pu ANSWER DOWNLOAD EXAMIANS APP
Power Systems Which of the following is/are the methods of improving transient stability? Fast acting excitation control Fast acting governing system All of these Dynamic breaking Fast acting excitation control Fast acting governing system All of these Dynamic breaking ANSWER DOWNLOAD EXAMIANS APP
Power Systems A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is 159.24 m/s 32 m/s 159.24 m/µs 0.0312 m/s 159.24 m/s 32 m/s 159.24 m/µs 0.0312 m/s ANSWER DOWNLOAD EXAMIANS APP
Power Systems The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers) N = 3x²-2x+1 N = 3x²-6x+1 N = 3x²-3x+1 N = 3x²+3x+1 N = 3x²-2x+1 N = 3x²-6x+1 N = 3x²-3x+1 N = 3x²+3x+1 ANSWER DOWNLOAD EXAMIANS APP
Power Systems An ACSR conductor has internal inductance 0.05 mH/Km for µr = 1. If this ACSR is replaced with another having µr = 2, then find the internal inductance? 0.1 mH/Km 0.025 mH/Km 0 mH/Km 0.05 mH/Km 0.1 mH/Km 0.025 mH/Km 0 mH/Km 0.05 mH/Km ANSWER DOWNLOAD EXAMIANS APP
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